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Rails and attr_accessible: is there a way to raise an exception if a non-mass-assignable attribute is mass-assigned?
by squarecut1 in Programming Languages

Is there a way to have rails raise an error if an attempt is made to mass-assign attributes that aren't allowed by attr_accessible?


This would be handy in development to remind me why my shiny new model isn't working, and also good to log in production in order to detect malicious activity.


I'm using rails 2.3.8 but will probably soon be migrating to 3.


Can't mass assign protected attributes - it's mass assigning fields in attr_accessor
by jasonmoo in Programming Languages

Can't mass-assign protected attributes: password, password_confirmation


Both of those fields are not mapped in the database, they are just fields in the form that I want to use to enable some nice validations.


Here is my model class:


class User < ActiveRecord::Base
attr_accessible :email, :password_hash, :password_salt
attr_accesso

The Reasons Why Mass Product Doesn't Equal Mass Reactant
by riahc3 in Hobbies, Games & Toys
In a chemical reaction, matter can neither be created nor destroyed. Sometimes, however, when you see the results from your experiment, it's easy to feel as if something strange must have taken place. Maybe you've come across an unexplained discrepancy, such as a difference between the mass of the product and the mass of the reactant. If so, there are several possibilities that could explain what

How to Find the Average Isotopic Mass Using Percent Abundance and Mass
by B3CFT in Careers & Job Searching
Each individual atom within an element has a specific mass. Yet the individual atoms vary in mass, depending on how many protons they have. Most lithium atoms, for example, contain four protons, lending them a relative mass of 7. A small percentage of lithium consists of an isotope whose relative mass is 6 because it has just three protons. The element's overall relative mass depends on its variou

High-Mass & Low-Mass Star Life Cycles
by baylisscg in Hobbies, Games & Toys
Stars are generally categorized by how they die; low-mass stars are those that end up as white dwarfs, and high-mass stars are those that end their lives in more dramatic fashion. However, despite their differences in size (some stars are as small as 10 percent of the size of the sun, while others are over 100 times larger ) stars of all masses generally have the same life cycle. BirthStars are

How to Get Mass Number by Using Mass and Percent Abundance ?
by Mansur in Hobbies, Games & Toys
The number of protons in an atomic nucleus is called the atomic number, and it is what distinguishes different elements, or types of atoms. All hydrogen atoms, for example, have nuclei with one proton. Isotopes are different forms of the same element which contain the same number of protons but different numbers of neutrons in the nucleus. Because protons and neutrons weigh the same, approximately

Principles of Modern Physics: Mass Without Having Mass
by pad in Hobbies, Games & Toys
In 1905, Albert Einstein published a paper proposing a solution to a few problems bothering physicists of that era. Mathematics and experimental evidence pointed to the idea that the energy in light possessed mass. Einstein stated that energy and mass are equivalent, and the equation E = mc^2 defines this equivalence. Energy translates to mass and has some of its properties. Mass of EnergyLarge

Traditional Mass Vs. Nontraditional Mass
by vxnick in Culture & Society
Catholic Mass is traditionally celebrated on Saturday evenings and Sunday mornings. There are two parts to a Catholic Mass: the Liturgy of the Word and the Liturgy of the Eucharist. In a traditional setting, Mass is sometimes said in Latin, and traditional religious music is used. In a non-traditional Mass, more modern religious music is used, and the message of the homilies focuses on hot-topic i

How to find the center of gravity or center of mass of an irregular body with uniform mass distribution?
by rixtertech in Development Tools & Services

Recently I was trying to solve a small AI problem but got stuck in between as I could not find the center of mass of the various bodies.
I was wondering if any one of you could help me out with this one.


Problem explanation: Assume that i have a 2D body which is very irregular in shape and has a uniform mass distribution throughout. It's like the body is made up of 'n' tiny par


Difference Between Relative Atomic Mass & Average Atomic Mass
by massmedia in Hobbies, Games & Toys
Atoms have several different components. In the nucleus or core of an atom, there are two types of particles, protons and neutrons. The protons determine what element the atom is, and the atom's properties. The neutrons have almost no effect on the atom's chemical properties, but do affect the atom's weight. Relative and average atomic mass both describe properties of an element related to its dif

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